“It’s disappointing when you get people from the football world speaking publicly and openly about one of our players like they (Birmingham) have done.

“When you do it when the competition is under way, it’s disrespectful to other clubs. We need to stop this sort of thing. It’s not healthy.” Martinez added: “Charles’s position is that he is a Wigan player, but if a club meets the valuation of the player then it will be a different story because we have always said that we would be fair with our players.

“If a club meets our valuation then a player will always be allowed to think about the option but, if we cannot find a replacement in time, that will come into consideration as well.”